<template>
  <div v-if="!item.hidden" class="menu-wrapper">
    <template
      v-if="hasOneShowingChild(item.children,item) && (!onlyOneChild.children||onlyOneChild.noShowingChildren)&&!item.alwaysShow">
      <app-link :to="resolvePath(onlyOneChild.path)">
        <el-menu-item :id="item.name" :index="resolvePath(onlyOneChild.path)"
          :class="{'submenu-title-noDropdown':!isNest}" @click="cli(item)">
          <item :meta="Object.assign({},item.meta,onlyOneChild.meta)" />
        </el-menu-item>
      </app-link>
    </template>

    <el-submenu v-else ref="subMenu" :index="resolvePath(item.path)">
      <template slot="title">
        <item :meta="item.meta" />
      </template>
      <sidebar-item v-for="child in item.children" :key="child.path" :is-nest="true" :item="child"
        :base-path="resolvePath(child.path)" class="nest-menu" />
    </el-submenu>
  </div>
</template>

<script>
import path from 'path'
import Item from './Item'
import AppLink from './Link'
import { isExternal } from '@/utils/validate'

export default {
  name: 'SidebarItem',
  components: { Item, AppLink },
  props: {
    // route object
    item: {
      type: Object,
      required: true
    },
    isNest: {
      type: Boolean,
      default: false
    },
    basePath: {
      type: String,
      default: ''
    }
  },
  data() {
    this.onlyOneChild = null
    return {}
  },
  methods: {
    cli(item) {
      // console.log(document.getElementsByClassName('el-submenu__title'))
      document.getElementsByClassName('el-submenu__title')[0].style.color =
        '#bfcbd9'
      document.getElementsByClassName('el-submenu__title')[1].style.color =
        '#bfcbd9'
      //  console.log(document.getElementById(item.name))
      // console.log(document.getElementById(item.name).parentNode.parentNode.parentNode.parentNode)
      document.getElementById(
        item.name
      ).parentNode.parentNode.parentNode.parentNode.firstChild.style.color =
        'white'
    },
    hasOneShowingChild(children = [], parent) {
      const showingChildren = children.filter(item => {
        if (item.hidden) {
          return false
        } else {
          // Temp set(will be used if only has one showing child)
          this.onlyOneChild = item
          return true
        }
      })
      // When there is only one child router, the child router is displayed by default
      if (showingChildren.length === 1) {
        return true
      }
      // Show parent if there are no child router to display
      if (showingChildren.length === 0) {
        this.onlyOneChild = { ...parent, path: '', noShowingChildren: true }
        return true
      }
      return false
    },
    resolvePath(routePath) {
      if (isExternal(routePath)) {
        return routePath
      }
      return path.resolve(this.basePath, routePath)
    }
  }
}
</script>
<style scoped>
.menu-wrapper .el-menu-item.is-active,
.el-menu-item:hover {
  /*透明度*/
  /*opacity:0.45;*/
  color: white !important;
  background-color: #1890ff !important;
}

.menu-wrapper .el-submenu__title > span:hover,
.el-menu-item > span:hover {
  color: white !important;
}
.menu-wrapper .el-submenu__icon-arrow {
  right: 30px;
}
</style>
